KR20080098182A - How to detect creep noise of wheel speed sensor - Google Patents

How to detect creep noise of wheel speed sensor Download PDF

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KR20080098182A
KR20080098182A KR1020070043540A KR20070043540A KR20080098182A KR 20080098182 A KR20080098182 A KR 20080098182A KR 1020070043540 A KR1020070043540 A KR 1020070043540A KR 20070043540 A KR20070043540 A KR 20070043540A KR 20080098182 A KR20080098182 A KR 20080098182A
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edges
edge
wheel speed
speed sensor
creep noise
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KR101179105B1 (en
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이상남
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주식회사 만도
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/1755—Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/173—Eliminating or reducing the effect of unwanted signals, e.g. due to vibrations or electrical noise
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/58—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration responsive to speed and another condition or to plural speed conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/30—Sensors
    • B60Y2400/303—Speed sensors
    • B60Y2400/3032—Wheel speed sensors

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Regulating Braking Force (AREA)

Abstract

본 발명은 휠 스피드센서의 크립 노이즈 검출 방법에 관한 것으로서, 보다 상세하게는 브레이크 패드가 브레이크 디스크를 제동할 때 타이어의 떨림등에 의해 발생되는 크립 노이즈(CREEP NOISE)를 용이하게 검출하여 운전 안정성을 향상시킬 수 있는 휠 스피드센서의 크립 노이즈 검출 방법에 관한 것이다.The present invention relates to a creep noise detection method of a wheel speed sensor, and more particularly, to improve driving stability by easily detecting creep noise generated by vibration of a tire when a brake pad brakes a brake disc. It relates to a creep noise detection method of a wheel speed sensor that can be made.

본 발명의 목적은, 휠스피드 센서에서 발생되는 크립노이즈를 정확하게 검출함으로써 차량 실제 속도와 측정 속도의 불일치에 따른 차량 안정성의 저하를 방지할 수 있는 휠 스피드센서의 크립 노이즈 검출 방법을 제공함에 있다.SUMMARY OF THE INVENTION An object of the present invention is to provide a creep noise detection method of a wheel speed sensor that can accurately prevent creep noise generated from a wheel speed sensor, thereby preventing deterioration of vehicle stability due to mismatch between actual vehicle speed and measurement speed.

상기한 목적을 실현하기 위하여 본 발명은, 차량의 브레이크가 작동하여 에지가 발생하면 상기한 에지중에서 최근에 발생된 몇 개의 에지를 추출하여 상기한 에지들의 평균값을 계산하는 단계와,In order to achieve the above object, the present invention provides a method for calculating an average value of edges by extracting several recently generated edges from the edges when the brakes of the vehicle are operated to generate edges;

상기한 에지들의 평균값과 현재 발생된 에지의 폭을 비교하여 에지의 폭이 일정 이하가 되면 크립노이즈 발생을 판단하는 단계로 구성함을 특징으로 한다.And comparing the average value of the edges with the width of the currently generated edge to determine creep noise when the width of the edge becomes less than a predetermined level.

Description

휠 스피드센서의 크립 노이즈 검출 방법{method to detect creep noise in wheel speed sensor}Method for detecting creep noise in wheel speed sensor

도1은 본 발명에 따른 휠 스피드센서의 크립 노이즈 검출 방법을 도시한 플로우차트.1 is a flowchart illustrating a creep noise detection method of a wheel speed sensor according to the present invention;

도2는 본 발명에 따라 휠 스피드센서에서 출력되는 에지의 계산 상태를 도시한 그래프,2 is a graph showing a calculation state of an edge output from a wheel speed sensor according to the present invention;

도3은 일반적인 차량의 휠 스피드센서에서 크립노이즈가 발생되는 것을 도시한 그래프. 3 is a graph illustrating creep noise occurring in a wheel speed sensor of a typical vehicle;

* 도면의 주요부분에 대한 부호의 설명            * Explanation of symbols for main parts of the drawings

Ta: 하이에지 Tb: 로우에지Ta: High Edge Tb: Low Edge

Tc: 크립노이즈 발생 시 하이에지Tc: High edge with creep noise

Td: 크립노이즈 발생 시 로우에지Td: Low edge when creep noise occurs

P: 에지 검출 간격P: edge detection interval

본 발명은 휠 스피드센서의 크립 노이즈 검출 방법에 관한 것으로서, 보다 상세하게는 브레이크 패드가 브레이크 디스크를 제동할 때 타이어의 떨림등에 의해 발생되는 크립 노이즈(CREEP NOISE)를 용이하게 검출하여 운전 안정성을 향상시킬 수 있는 휠 스피드센서의 크립 노이즈 검출 방법에 관한 것이다.The present invention relates to a creep noise detection method of a wheel speed sensor, and more particularly, to improve driving stability by easily detecting creep noise generated by vibration of a tire when a brake pad brakes a brake disc. It relates to a creep noise detection method of a wheel speed sensor that can be made.

일반적으로, 자동차에는 차량의 주행 안정성 향상 및 제동 안정성등을 위해 다양한 장치가 설치되어 있는 바, 휠의 슬립을 방지하기 위한 ABS(Anti-Lock Brake System) 및 TCS(Traction Control System)와, 차량 자세 제어를 위한 ESP(Electronic Stability Program)와, 현가 장치인 CDC(Continuous Damping Control)와, 조향장치인 ESP(Electric Power Steering)등이 장착된다.In general, automobiles are equipped with various devices for improving driving stability and braking stability of the vehicle.Anti-Lock Brake System (ABS) and Action Control System (TCS) to prevent slippage of the wheel, and vehicle attitude An electronic stability program (ESP) for control, a continuous damping control (CDC) that is a suspension device, and an electric power steering (ESP) that is a steering device are mounted.

상기한 각각의 장치들은 요레이트 센서, 조향각센서, 휠스피드센서, 브레이크압력센서, 횡가속도센서등과 같은 다양한 센서로부터 신호를 입력받아 브레이크 컨트롤러와 엔진컨트롤러등을 제어함으로써, 차량이 안정적으로 주행을 할 수 있도록 하는 것이다.Each of the above devices receives signals from various sensors such as yaw rate sensor, steering angle sensor, wheel speed sensor, brake pressure sensor, lateral acceleration sensor and the like to control the brake controller and engine controller, so that the vehicle can run stably. To do it.

여기서, 상기한 휠스피드센서는 ABS, ECS등의 제어장치에 가장 중요한 휠 스피드 신호를 전송하게 되는 바, 상기한 휠스피드 센서에서의 휠속도 검출은 휠과 함께 회전함과 아울러 일정 간격으로 치(EDGE)가 형성된 톤휠의 회전을 홀센서가 검출하여 출력신호의 파장으로 회전속도를 추정하게 된다.Here, the wheel speed sensor transmits the most important wheel speed signal to a control device such as ABS, ECS, and the like. The wheel speed detection in the wheel speed sensor rotates together with the wheel and at a predetermined interval. The Hall sensor detects the rotation of the tone wheel on which the EDGE) is formed and estimates the rotation speed based on the wavelength of the output signal.

즉, 일정 시간동안 통과된 치의 개수만큼 에지가 발생되고 상기한 에지의 주기를 통해 휠의 스피드를 추정하게 되는 것이다.That is, edges are generated as many as the number of teeth passed for a predetermined time, and the wheel speed is estimated through the period of the edges.

그러나, 상기한 바와 같이 휠스피드센서를 통해 휠속도를 측정할 때 도3에 도시된 바와 같이 차량이 브레이크를 작동하게 되면 점차 속도가 감소되면서 브레이크 디스크의 떨림에 의해 A 부분과 같은 크립노이즈(CREEP NOISE)가 발생되고, 상기한 크립노이즈에 의해 차량 속도의 연산이 부정확하게 됨으로써 차량 자세 제어가 불안정하게 되는 문제점이 있다.However, when measuring the wheel speed through the wheel speed sensor as described above, if the vehicle operates the brake as shown in FIG. 3, the speed is gradually reduced and the creep noise of the A portion is caused by the vibration of the brake disc. Noise) is generated, and the calculation of the vehicle speed is inaccurate due to the creep noise described above, resulting in unstable vehicle attitude control.

즉, 실제 차량 속도와 휠스피드 센서에서 측정된 차량 속도가 상이하게 됨으로써, ABS, ESP등의 제어 시스템에서 오작동을 유발하게 되어 차량의 안정성이 매우 저하되는 문제점이 있는 것이다.That is, the actual vehicle speed and the vehicle speed measured by the wheel speed sensor are different, causing a malfunction in the control system such as ABS, ESP, so that the stability of the vehicle is very low.

따라서, 본 발명의 목적은 상기한 문제점을 해결하기 위한 것으로서, 휠스피드 센서에서 발생되는 크립노이즈를 정확하게 검출함으로써 차량 실제 속도와 측정 속도의 불일치에 따른 차량 안정성의 저하를 방지할 수 있는 휠 스피드센서의 크립 노이즈 검출 방법을 제공함에 있다.Accordingly, an object of the present invention is to solve the above problems, and by accurately detecting the creep noise generated from the wheel speed sensor, a wheel speed sensor that can prevent the deterioration of the vehicle stability due to the mismatch between the actual speed and the measured speed. A creep noise detection method is provided.

상기한 목적을 실현하기 위하여 본 발명은, 차량의 브레이크가 작동하여 에지가 발생하면 상기한 에지중에서 최근에 발생된 몇 개의 에지를 추출하여 상기한 에지들의 평균값을 계산하는 단계와,In order to achieve the above object, the present invention provides a method for calculating an average value of edges by extracting several recently generated edges from the edges when the brakes of the vehicle are operated to generate edges;

상기한 에지들의 평균값과 현재 발생된 에지의 폭을 비교하여 에지의 폭이 일정 이하가 되면 크립노이즈 발생을 판단하는 단계로 구성함을 특징으로 한다.And comparing the average value of the edges with the width of the currently generated edge to determine creep noise when the width of the edge becomes less than a predetermined level.

도1은 본 발명에 따른 휠 스피드센서의 크립 노이즈 검출 방법를 도시한 플로우차트이고, 도2는 휠 스피드센서에서 출력되는 에지를 도시한 그래프로서, 현재 차량이 브레이킹 상태인지를 판단하여 브레이크가 작동하면, 에지가 발생하는지의 여부를 판단하게 된다.1 is a flowchart illustrating a creep noise detection method of a wheel speed sensor according to the present invention, and FIG. 2 is a graph illustrating an edge output from the wheel speed sensor. When the brake is operated by determining whether the vehicle is in a braking state. It is determined whether or not an edge occurs.

에지가 발생하면 상기한 에지중에서 최근에 발생된 몇 개의 에지를 추출하여 상기한 에지들의 평균값을 계산하게 된다.When an edge is generated, several recently generated edges are extracted from the edges to calculate an average value of the edges.

즉, 도2에 도시된 바와 같이 최근에 발생된 에지에서 일정 간격P(일정 시간)의 에지를 선정하여 하이 에지(HIGH EDGE) Ta와 로우 에지(LOW EDGE) Tb의 평균값을 계산하게 되고, 상기한 평균값을 저장하게 된다.That is, as shown in FIG. 2, the edges of a predetermined interval P (constant time) are selected from recently generated edges to calculate an average value of the high edge Ta and the low edge Tb. It will store an average value.

상기한 에지들의 평균값을 계산하는 간격 P는 1개 내지 2개정도의 에지가 포함될 정도의 간격을 갖도록 설정하면 된다.The interval P for calculating the average value of the edges may be set to have an interval such that one to two edges are included.

에지들의 평균값을 저장한 상태에서 ECU는 계속적으로 휠스피드 센서에서 출력되는 에지들의 하이 에지와 로우 에지의 간격(펄스폭)을 체크하게 되는 바, 예를 들어 도2의 Tc(하이에지값), Td(로우에지값)와 같이 매우 펄스폭이 작은 에지가 발생되면 이를 그전에 저장된 에지의 평균값과 비교하게 된다.In the state of storing the average value of the edges, the ECU continuously checks the interval (pulse width) between the high edge and the low edge of the edges output from the wheel speed sensor, for example, Tc (high edge value) of FIG. When an edge with a very small pulse width occurs, such as Td (low edge value), it is compared with the average value of the previously stored edge.

상기한 Tc값과 평균값을 비교하여 일정 이하가 되면 크립노이즈로 판단하게 된다.When the Tc value and the average value are compared and determined to be below a predetermined value, it is determined as creep noise.

특히, 상기한 Tc는 하이에지값의 평균값을 비교하고, Td는 로우에지값의 평균값을 비교하여 각 값들이 평균값의 일정 이하가 되면 비정상적인 것인 바, 이를 크립노이즈로 판단하게 되는 것이다.In particular, the Tc compares the average value of the high edge value, and the Td compares the average value of the low edge value and is abnormal when each value falls below a predetermined value of the average value, which is determined as a creep noise.

여기서, 상기한 하이 에지값과 로우 에지 값을 별도로 구분하여 비교하는 것은, 톤휠의 치(TEETH)의 하이, 로우값이 다르기 때문에, 이를 구분하여 평균값을 구하고 이를 에지값과 비교하는 것이 보다 정확하기 때문이다.Here, comparing the high edge value and the low edge value separately, the high and low values of the tone wheel's value (TEETH) are different, so it is more accurate to calculate the average value by comparing them with the edge value. Because.

물론, 상기한 몇 개의 에지값을 그냥 하이, 로우 구분하지 않고 평균값을 구하고 이를 에지값과 비교하여도 어느정도는 크립노이즈를 검출할 수 있게 된다.Of course, it is possible to detect the creep noise to some extent even by calculating the average value without comparing the above-described edge values with high and low values.

이상과 같이 본 발명은 휠 스피드센서에서 출력되는 에지값중 최근 몇 개값의 평균값을 구하고, 상기한 평균값과 발생되는 에지를 비교하여 일정 이하가 되면 이를 크립노이즈로 판단함으로써, 용이하게 크립노이즈를 검출하고 이에 따라 차량 제어의 오작동을 방지할 수 있는 잇점이 있는 것이다.As described above, the present invention obtains an average value of several recent edge values output from the wheel speed sensor, compares the average value with the generated edge, and determines the creep noise when it is below a certain level, thereby easily detecting creep noise. Therefore, there is an advantage that can prevent the malfunction of the vehicle control.

Claims (2)

차량의 브레이크가 작동하여 에지가 발생하면 상기한 에지중에서 최근에 발생된 몇 개의 에지를 추출하여 상기한 에지들의 평균값을 계산하는 단계와,Calculating a mean value of the edges by extracting a few recently generated edges from the edges when the brake of the vehicle is activated; 상기한 에지들의 평균값과 현재 발생된 에지의 폭을 비교하여 에지의 폭이 일정 이하가 되면 크립노이즈 발생을 판단하는 단계로 구성함을 특징으로 하는 휠 스피드센서의 크립 노이즈 검출 방법.And comparing the average value of the edges with the width of the currently generated edge, and determining creep noise when the width of the edge becomes less than a predetermined level. 제1항에 있어서,The method of claim 1, 상기한 에지의 평균값을 구하는 것은 하이 에지 Ta와 로우 에지 Tb로 구분하여 평균값을 계산하고 현재 출력되는 에지의 하이에지Tc와 로우 에지Td의 폭을 각각 비교하는 것을 특징으로 하는 휠 스피드센서의 크립 노이즈 검출 방법.The average value of the edge is divided into a high edge Ta and a low edge Tb, and the average value is calculated. The creep noise of the wheel speed sensor is characterized by comparing the widths of the high edge Tc and the low edge Td of the currently output edge. Detection method.
KR1020070043540A 2007-05-04 2007-05-04 method to detect creep noise in wheel speed sensor Active KR101179105B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9193340B2 (en) 2013-10-31 2015-11-24 Electronics And Telecommunications Research Institute Wheel speed sensor interface, operation method thereof, and electronic control system including the same
KR20190044173A (en) * 2017-10-20 2019-04-30 주식회사 만도 Electric brake system and control method of thereof

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US4039227A (en) 1976-04-16 1977-08-02 Kelsey-Hayes Company Skid control system having a switched low speed noise filter
US7182411B2 (en) * 2001-03-23 2007-02-27 General Electric Company Pneumatic-based communications system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9193340B2 (en) 2013-10-31 2015-11-24 Electronics And Telecommunications Research Institute Wheel speed sensor interface, operation method thereof, and electronic control system including the same
KR20190044173A (en) * 2017-10-20 2019-04-30 주식회사 만도 Electric brake system and control method of thereof

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